Memory cells having a select device material located between a first electrode and a second electrode, a memory element located between the second electrode and a third electrode, and a number of conductive diffusion barrier materials located between a first portion of the memory element and a second portion of the memory element. The reaction of the exothermic material, which is set off when it comes in contact with the metal, prolongs the solidification time of the riser thus rendering it more effective. The invention further relates to hybrid cotton seeds and plants produced by crossing the cultivar DPX 08Q818F with another cotton cultivar. Furthermore, each of the distributor frames is formed with a plurality of terminals to be electrically connected to one electrode of a DC high-voltage power supply, but the ducts are adapted to be electrically connected to the other electrode of the DC high-voltage power supply. This is achieved directly by subtracting a prerecorded baseline from the measurements; or by determining the CTE measurement for various sample lengths and obtaining the slope of a straight line through the points on a MD DT versus sample length plot.